. ♪ let it snow, let it snow of washington about the future of medicare and social security. anncr: but you deserve straight talk about the options on the... table and what they mean for you and your family. ancr: aarp is cutting through all the political spin. because for our 37 million members, only one word counts. get the facts at earnedasay.org. let's keep medicare... and social security strong for generations to come. >> stahl: now, an update on our story from a year ago called "the pledge," a look at the power wielded by lobbyist and anti-tax crusader grover norquist. nearly every republican in congress has signed the promise that they will never, under any circumstances, vote to raise taxes on anyone. here's what norquist, the pledge's originator and chief enforcer, told steve kroft. >> grover norquist: republicans who vote for a tax increase are rat heads in a coke bottle. they damage the brand for everyone else. >> stahl: now, as the country approaches the fiscal cliff, a handful of republicans have defied norquist and say they'll consider raising new revues, and 12